Casey is reading a book for a book report. at 3: 30 p. m., he started reading where he had left off the day before.

at 5: 30 p. m. he was on page 160. at 8: 00 p. m. he was on page 280. if reading the book is modeled by a linear function, what page did casey start on at 3: 30 p. m.?

a) 60
b) 64
c) 70
d) 74